You can find a guide for registrating courses in Whiteboard here.

In Whiteboard you can register your courses manually on your own without the need to be registered in Campus Management. For that, log in in Whiteboard with your student account and choose "FU Site Browser" from your home-landing page overview. On that page all courses are listed for the chosen semester and faculty in a tabular. You can also search for specific courses. If you've found your course, you can see a button saying "Join" on the right in the tabular. As soon as you click on it, you are registered. 

But there is also another way: Instead "FU Site Browser" you can also choose "Membership" from your home landing page, it works quite similar. But there is an additional step: if you land on your "Membership" page, the first courses you see are the courses you are already a member in, called "Your sites". Next to that tab there is "Joinable sites". Choose that one and you get to the overview of courses you are not a member in. Then you can choose your courses like the other version. 

Note: The differece lies here: As the name already sugests, you can find all courses under "Joinable Sites" from the Membership page where you are not a member (yet). With "FU Site Browser", you find all courses listed there, even those you already are registered but with the remark that you can't join anymore as you already are a member. 

Note (again): Sometimes your course is not listed there right from the beginning. Most of the time it is just the pre-setting from the filters. Sometimes the semester is not the one you are looking for, other times it is pre-chosen the wrong department or the wrong faculty. Just change it and your courses should show up. So make sure that the right settings are chosen before you look for your courses. 

Because you have to formally register in Campus Management, it can be that your courses already show up without registering for them in Whiteboard maually. But this only happens if it is safe with capacities and it happens mostly over night. So don't be too surprised if they don't show up yet!